#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdlib.h>
#include <iostream>
#include <vector>
#include <functional>
using namespace std;

using fun_t = function<void()>;
void Print1()
{
  cout << "hello linux" << endl;
}
void Print2()
{
  cout << "hello C++" << endl;
}
